【单选题】听力原文:Where is the nearest post office? (5)
A.
The post office is too distant.
B.
There is only one post office.
C.
I don't want to go to the post office.
D.
Look, just over there.
【简答题】A.It's next to the post office. B.It's to the right of the post office. C.It's close to the supermarket. D.It's opposite to the supermarket.
【单选题】牵出线换算容车数计算方法:按线路有效长减去一台机车长度及()m安全距离后,分别除以换算长度11m和14.3m。
【简答题】影响电火花加工极性效应的因素有脉冲 和脉冲 。
【单选题】已知一个正弦交流电压为u = 311sin(100πt – 60°)V,则它的最大值、频率和初相分别是 。
【判断题】牵出线换算容车数计算方法:按线路有效长减去一台机车长度及10m安全距离后,分别除以换算长度11m和14.3m
【判断题】桔梗药性升散,凡气机上逆,呕吐、呛咳、眩晕、阴虚火旺咳血等不宜用。
【简答题】影响点火花加工极性效应的因素有脉冲____和脉冲____。